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Relatively high load (up to 600 mN resulting in more than 6 μm contact depth) indentations using partial-unloading profiles were performed on two different coatings, Resin/PTFE/MoS2 and PTFE/Pyrrolidone-2, as seen in Figure 4.8. These experiments were able to extract the mechanical properties of the coating, and clearly observe the overall behavior of the substrate-coating system. The elastic modulus and hardness values are shown in Figure 4.8(a) and 4.8(b), respectively. Both figures show higher mechanical property values for Resin/PTFE/MoS2 compared to PTFE/Pyrrolidone-2, through the whole depth range. Of particular interest is to obtain the coating properties decoupled from the substrate effect. The elastic modulus of Resin/PTFE/MoS2 initially showed an increasing trend up to 1 μm contact depth, then exhibited a small plateau region from 1 μm to 1.5 μm, and then started to increase again with increasing contact depth, as seen in Figure 4.8(a). 10 20 16 1 4.8 GPa Resin/PTFE/MoS2 PTFE/Pyrrolidone-2 3.7 GPa 1 10 1.5 μm 2.6 μm 12 8 4 0 200 160 120 80 40 (a) (b) 78 MPa Resin/PTFE/MoS2 PTFE/Pyrrolidone-2 52 MPa 0 0 2 4 6 0 2 4 6 hc (μm) hc (μm) Figure 4.8 (a) Elastic modulus (inset shows the same plot in log-log scale), (b) hardness values calculated from partial-unloading indentations for Resin/PTFE/MoS2 and PTFE/Pyrrolidone-2 coatings. Indicated plateau regions show the polymeric coating properties without substrate effects. 63 Er (GPa) H (MPa)PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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